Local time in Melbourne is always 3 hours ahead of Singapore time and Singapore is 5 hours behind Wellington, which is 12 hours ahead of London. What is the time difference between Melbourne and London?

Ineed i been stuck on this question since yesterday

Which statements are true? check all that apply. the line x = 0 is perpendicular to the line y = –3. all lines that are parallel to the y-axis are vertical lines. all lines that are perpendicular to the x-axis have a slope of 0. the equation of the line parallel to the x-axis that passes through the point (2, –6) is x = 2. the equation of the line perpendicular to the y-axis that passes through the point (–5, 1) is y = 1.

For what values of the variable x is the expression square root of 7x+14+ square root of 7-x a real number?